Word: superfluous
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Dates: during 2010-2019
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...deadly H5N1 avian virus with strains of H3N2 human seasonal flu, creating 254 new, mutated viruses. By injecting them in lab mice, researchers found that some of the hybrid viruses were both deadly (like bird flu) and transmissible (like seasonal human flu) - the kind of genetically mutated superflu viruses that experts have been warning about for decades. (See how to prevent illness...
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